铝合金TIG焊变极性参数对阴极清理及钨极烧损的影响  

Effects of variable polarity parameters on cathode cleaning and deterioration of tungsten in TIG welding of aluminum alloy

作　　者：柏久阳[1] 林三宝[1] 杨春利[1] 陈彦宾[1] 田志杰[2] 高彦军[2] 李延民[2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,150001 [2]首都航天机械公司,北京市100076

出　　处：《焊接》2015年第5期9-13,68,共5页Welding & Joining

基　　金：数控机床专项(2010ZX04007~021)

摘　　要：采用变极性钨极惰性气体保护焊(VP-TIG)方法焊接铝合金时,需要在保证阴极清理区宽度的同时减小钨极烧损程度。通过调节电极接正半波时间、电极接正半波电流和变极性频率,来考察铝合金VP-TIG焊接过程中变极性参数对阴极清理区宽度和钨极烧损情况的影响。试验结果发现,电极接正半波电流时间和电极接正半波电流的增大都会使阴极清理区的宽度和钨极烧损程度增大,但变极性频率对两者影响很小。进一步研究可以发现,阴极清理是一个热和力共同作用的结果,而钨极烧损是一个热量积累的作用结果。In VP- TIG welding of aluminum alloy,the enough width of cathode cleaning zone need to be kept,at the same times the tungsten electrode is protected from deterioration seriously.In this paper,by adjusting the DCEP time,DCEP current and frequency,the effects of variable polarity parameters on cathode cleaning zone width and deterioration of tungsten were studied.Results show that the increase of DCEP time and DCEP current can increase both the width of the cathode cleaning zone and deterioration of tungsten.On the contrary,the frequency has little effects on both results.From further analyses,a conclusion can be concluded that the cathode cleaning effect is a result of heat and power combination,and the deterioration of the tungsten is a result of heat accumulation.

关 键 词：变极性 阴极清理 钨极烧损 

分 类 号：TG42[金属学及工艺—焊接]